Need help in creating login/logout feature using GWT

Question

i am trying to add a login/logout feature to my web-app using UserService. Here is the relevant code :

1) the Entry Point class :-

public class MarkerSimple implements EntryPoint {

    static LoginInfo loginInfo = null;

  @Override
  public void onModuleLoad() { 

      System.out.println("onModuleLoad");

    LoginServiceAsync loginService = GWT.create(LoginService.class);
    loginService.login(GWT.getHostPageBaseURL(), new AsyncCallback<LoginInfo>() {

      public void onFailure(Throwable error) {
          System.out.println("ERROR FETChinG Data");
      }

      public void onSuccess(LoginInfo result) {

          System.out.println(result);

        loginInfo = result;
        if(loginInfo.isLoggedIn()) {

          Constants.isLoggenIn = true;
        } else {

          Constants.isLoggenIn = false;
        }
        loadLogin();
      }
      });
  }

  private void loadLogin() {

      RootLayoutPanel.get().add(new GwtMaps());
  }
}

2) the Composite class :-

public class GwtMaps extends Composite {

    interface LoginWidgetURLBinder extends UiBinder <DockLayoutPanel, GwtMaps> {    }
    private static LoginWidgetURLBinder uiBinder = GWT.create(LoginWidgetURLBinder.class);

    private GoogleMap map;
    int i=0;

    static Boolean isLoaded = false;

    @UiField
    Label label1;

    @UiField
    RadioButton myRadioAble;    

    @UiField
    SimpleLayoutPanel map_canvas;

    @UiField
    static Anchor signin;


    public GwtMaps() {

        System.out.println("GwtMaps");
        initWidget(uiBinder.createAndBindUi(this));     
        isLoaded = true;
        anchorHandler();
        LatLng myLatLng = LatLng.create(28.60753,77.03505);
        MapOptions myOptions = MapOptions.create();
        myOptions.setZoom(20.0);
        myOptions.setCenter(myLatLng);
        myOptions.setMapTypeId(MapTypeId.ROADMAP);
        map = GoogleMap.create(map_canvas.getElement(), myOptions);
        map.addClickListener(new ClickHandler() {

            @Override
            public void handle(MouseEvent event) {
                i++;
                addMarker(event.getLatLng());
            }
        }); 



    }

      private void addMarker(LatLng location) {
            MarkerOptions newMarkerOpts = MarkerOptions.create();
            newMarkerOpts.setPosition(location);
            newMarkerOpts.setMap(map);
            newMarkerOpts.setTitle("Marker"+i);
            newMarkerOpts.setDraggable(true);
            newMarkerOpts.setAnimation(Animation.DROP);
            Marker.create(newMarkerOpts);
      }

      public static void anchorHandler() {

            if(Constants.isLoggenIn == false) {

                signin.setText("SignIn using Google");
                signin.setHref(MarkerSimple.loginInfo.getLoginUrl());
            } else {                

                signin.setText("SignOut");
                signin.setHref(MarkerSimple.loginInfo.getLogoutUrl());
            }           
      }
}

The problem is if the user was not logged in, even after logging in, following the Anchor, the data received from the RPC is not captured. Also i need a way to change the Anchor dynamically after performing a login or logout so that the same Anchor can perform a logout or login. Please Help

Answer 1

1. I don't think you can have a static @UiField as your signin is configured.

2. Do you have the url configured in the .ui.xml because if not I do not see where you are doing a signIn.addClickHandler() and calling the login method.

3. I would move the login call to your view instead of having it in your module so that you can call it from the anchor with an addClickHandler or a @UiHandler("signin"). And make your module simply load the view.

   public class MarkerSimple implements EntryPoint {
       @Override
       public void onModuleLoad() {
           // Just this. 
           RootLayoutPanel.get().add(new GwtMaps());
       }
   }